Chilled roll and method of making same



Patented Feb. 20, 1934 CHILLED ROLL AND METHOD OF MAKING SAME William H.Seaman, Hammond, Ind.

No Drawing. Application May 3, 1930, Serial No. 449,687. RenewedDecember 11, 1933 2 Claims. (01. 80-58) The present invention relates ingeneral to a novel alloy of iron for use in a chilled cast iron rollemployed for rolling steel and other metals.

One of the objects of the present invention is to provide an alloy ironof such character that when cast in chill molds will give a sclerescopichardness throughout the chill of from 80 to 90.

A further object is to provide an, iron alloy roll in which the chill isof substantially uniform hardness throughout its depth.

Another object is to provide an iron alloy roll in which the depth ofthe chill may be varied.

A still further object is to provide an iron alloy chilled roll whichmay be-used convenient- 1y for rolling mill work.

Still another object is to provide a chill roll of this character whichfor lighter work may be employed in cold rolling.

There are other objects of my invention which together with theforegoing will be described in the detailed specification which is tofollow.

It has been difficult to obtain an alloy cast iron roll which could beemployed for cold rolling work. This necessitated the employment of aforged steel case hardened roll which was not only exceedinglyexpensive, but short lived and diflicult to make.

My improved alloy of iron is suitable to be cast into chill rolls andwill have a sclerescopic hardness of from 80 to 90 throughout the chill.

The general characteristic of this iron alloy roll is a very high carboncontent, the efiect of which is to increase the hardness. This resultsin considerably more graphitic carbon in the gray iron interior of theroll. There is also a high nickel content which increases the hardnessand in combination with the carbon renders the chill of uniform texturethroughout the chill. Alow chromium content is also present, beingapproximately 10% olf the nickel. The chromium in connection with thecarbon and nickel produces a chilled alloy iron roll that is exceedinglyhard throughout the depth thereof as well as being of uniform texture,tough and resilient.

Of course, in addition to these main constituents there are the usualelements of manganese, silicon, sulphur, and phosphorus in suitableproportions. The proportions of the elements of the iron alloy inaddition to iron to obtain a chill roll having a sclerescopic hardnessof 80 to 90 and the characteristics set forth are given below:--

'r.c. Mn Si s P Cr Ni 3.15 .18 .25 .115 .18 .25 3.50 Hardness 80 to 90to to to to to to to The sclerescopic hardness from 85 to 90 permitscold rolling of numerous shapes which have heretofore required casehardened forged steel rolls. This greatly reduces the cost of materialrolled.

My invention may be variously modified without departing from' thespirit and scope thereof, as set forth in the appended claims.

I claim:

1. The method of making chilled iron alloy rolls which consists inensuring a chill by using small quantities of silicon, manganese andchromium running from about .25 to about .35 silicon and from about .25to about .35 chromium and from about .18 to about .22 manganese andsecuring hardness of said chill by using carbon and nickel as desiredfrom about 3.15 to about 3.20 carbon and from about 3.50 to about4.0nickel.

2. A chilled iron alloy roll containing a small amount of silicon,chromium and manganese to ensure a chill, said amounts running fromabout .25 to about .35 silicon and from about .18 to about .22 manganeseand from about .25 to about .35 chromium, said roll also containingsubstantial quantities of carbon and nickel to secure hardness of saidchill, said carbon running from about 3.15 to about 3.20 and said nickelrunning from about 3.50 to about 4.0.

' WILLIAM H. SEAMAN.

